Flow path system of pH and total alkalinity online analyzer
By designing a flow path system for online analyzers, the automatic calibration of acid pH standard solution and acid standard buffer solution is achieved, which solves the problem that existing online analyzers are difficult to ensure the measurement data quality under long-term unattended state, and ensures the accuracy and stability of the data.
Patent Information
- Application Number
- CN202421479818.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-06-26
AI Technical Summary
The lack of automatic calibration function of existing online analyzers makes it difficult to ensure the quality of measurement data in a long-term unattended state.
A flow path system for pH and total alkalinity online analyzer is designed, including a dispensing valve, a pump body, a mixing stir tank and an electrode assembly. The first, second and third control valves are automatically controlled by the control assembly to realize automatic calibration of acid pH standard solution and acid standard buffer solution.
Automatic calibration is achieved under long-term unattended state, ensuring the quality and accuracy of the measured data of the water sample to be measured, and avoiding the impact of the interval time of manual calibration on data quality.
Smart Images
Figure CN222939047U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of on-line analyzer calibration, and more specifically, relates to a flow path system of a pH and total alkalinity on-line analyzer. Background Technique
[0002] The total alkalinity of process water in an industrial water system refers to the amount of a strong monobasic acid required to lower the pH of a unit volume of the water sample to be measured to the methyl orange color change point (about pH 4.00). It can also be calculated based on the pH of an acidic standard buffer solution with a known buffer capacity (denoted as pH 0 ) and the pH (denoted as pH x ) after mixing it with the water sample to be measured for alkalinity in a fixed volume ratio (such as 1:1).
[0003] Currently, when detecting the pH of a water sample to be measured, most on-line analyzers of the sensor type do not have an automatic calibration function. It is necessary for maintenance personnel to go to the site for manual calibration at intervals (usually once a month or several months). However, this calibration interval is too long and cannot guarantee the quality of measurement data in a long-term unattended state. Most users are skeptical about such data. In principle of quantitative analysis of instruments, any analyzer should be calibrated before measurement to ensure the quality of measurement data. Content of the Utility Model
[0004] The purpose of the utility model is to provide a flow path system of a pH and total alkalinity on-line analyzer aiming at the deficiencies of the existing technology, so as to solve the problem that most current on-line analyzers of the sensor type do not have an automatic calibration function and it is necessary for maintenance personnel to go to the site for manual calibration at intervals, which seriously affects the quality of detection data in a long-term unattended state as mentioned in the above background technique.
[0005] To achieve the above purpose, the utility model provides a flow path system of a pH and total alkalinity on-line analyzer, which includes:
[0006] A liquid distribution valve, a pump body, a mixing and stirring tank, and an electrode assembly connected in sequence. The liquid distribution valve is used to distribute one of air, an acidic pH standard solution containing a total ion strength adjuster, an acidic standard buffer solution containing a total ion strength adjuster, and a water sample to be measured into the pump body;
[0007] A first control valve, a second control valve, and a third control valve. The first control valve is arranged between the pump body and the mixing and stirring tank, and the first control valve can control the fluid to be discharged from the system or discharged into the mixing and stirring tank. The second control valve is arranged between the mixing and stirring tank and the battery assembly. The mixing and stirring tank is provided with an emptying port, and the emptying port is connected to the third control valve;
[0008] A control component, which is electrically connected to a liquid dispensing valve, a first control valve, a second control valve, a third control valve and a mixing and stirring tank. The control component can send instructions to the liquid dispensing valve, the first control valve, the second control valve, the third control valve and the mixing and stirring tank to enable the electrode component to sequentially measure the pH of an acidic pH standard solution, an acidic standard buffer solution and a water sample to be measured.
[0009] Preferably, the liquid dispensing valve is provided with a flow distribution outlet, an air inlet, an acidic pH standard solution inlet, an acidic standard buffer solution inlet and a water sample to be measured inlet.
[0010] Preferably, the first control valve is provided with a first inlet, a first outlet and a second outlet, and the first outlet is communicated with the mixing and stirring tank.
[0011] Preferably, the first control valve is a solenoid valve.
[0012] Preferably, both the second control valve and the third control valve are pressure tube valves.
[0013] Preferably, the pump body is a peristaltic pump.
[0014] Preferably, the flow path system of the pH and total alkalinity on-line analyzer further includes a filter head, and the filter head is connected to the water sample to be measured inlet.
[0015] Preferably, the electrode assembly includes a pH potential detection component.
[0016] Preferably, the flow path system of the pH and total alkalinity on-line analyzer further includes a locator, and the locator is arranged between the second control valve and the electrode assembly.
[0017] Preferably, both the second outlet and the outlet of the electrode assembly lead to the outside of the system (generally a waste liquid bottle or a waste liquid barrel).
[0018] The present utility model provides a flow path system of a pH and total alkalinity on-line analyzer, and its beneficial effects are as follows: the first control valve, the second control valve and the third control valve of the flow path system can realize opening and closing actions after receiving instructions to sequentially measure the pH of an acidic pH standard solution, an acidic standard buffer solution and a water sample to be measured. Before each measurement of the water sample to be measured, the control component compulsorily and automatically uses the two standard points of the acidic pH standard solution and the acidic standard buffer solution for calibration, ensuring the quality of the measurement data of the water sample to be measured. In the state of long-term unattended operation, there is no need for maintenance personnel to go to the site for manual calibration, ensuring the pH of the water sample to be measured measured by the on-line analyzer each time and the total alkalinity calculated by pH.
[0019] Other features and advantages of the present utility model will be described in detail in the following specific implementation manner section. Brief Description of the Drawings
[0020] The above and other objects, features, and advantages of the present utility model will become more apparent by describing the exemplary embodiments of the present utility model in more detail in conjunction with the accompanying drawings, wherein, in the exemplary embodiments of the present utility model, the same reference numerals generally represent the same components.
[0021] Figure 1 Fig. 1 shows a schematic structural diagram of a flow path system of a pH and total alkalinity on-line analyzer according to an embodiment of the present utility model.
[0022] Description of the Reference Numerals in the Drawings:
[0023] 1, liquid distribution valve; 2, pump body; 3, mixing and stirring tank; 4, electrode assembly; 5, first control valve; 6, second control valve; 7, third control valve; 8, vent port; 9, air inlet; 10, acidic pH standard solution inlet; 11, acidic standard buffer solution inlet; 12, water sample to be measured inlet; 13, first outlet; 14, second outlet. Detailed Embodiments
[0024] The preferred embodiments of the present utility model will be described in more detail below. Although the preferred embodiments of the present utility model are described below, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present utility model more thorough and complete, and to fully convey the scope of the present utility model to those skilled in the art.
[0025] As Figure 1 shown, the present utility model provides a flow path system of a pH and total alkalinity on-line analyzer, and the flow path system includes:
[0026] A liquid distribution valve 1, a pump body 2, a mixing and stirring tank 3, and an electrode assembly 4 connected in sequence. The liquid distribution valve 1 is used to distribute one of air, acidic pH standard solution containing total ion strength regulator, acidic standard buffer solution containing total ion strength regulator, and water sample to be measured into the pump body 2;
[0027] A first control valve 5, a second control valve 6, and a third control valve 7. The first control valve 5 is arranged between the pump body 2 and the mixing and stirring tank 3, and the first control valve 5 can control the fluid to be discharged from the system or discharged into the mixing and stirring tank 3. The second control valve 6 is arranged between the mixing and stirring tank 3 and the battery assembly 4. The mixing and stirring tank 3 is provided with a vent port 8, and the vent port 8 is connected to the third control valve 7;
[0028] Control component, which is electrically connected to the liquid dispensing valve 1, the first control valve 5, the second control valve 6, the third control valve 7 and the mixing and stirring tank 3. The control component can send instructions to the liquid dispensing valve 1, the first control valve 5, the second control valve 6, the third control valve 7 and the mixing and stirring tank 3 to enable the electrode assembly 4 to measure the pH of the acidic pH standard solution, the acidic standard buffer solution and the water sample to be measured in sequence.
[0029] Specifically, to solve the problem that most current on-line analyzers of sensor type do not have an automatic calibration function, and it is necessary for maintenance personnel to go to the site for manual calibration at intervals, which seriously affects the quality of detection data in the long-term unattended state. The present utility model provides a flow path system for a pH and total alkalinity on-line analyzer. The control component of this flow path system is a PLC controller. The PLC controller is programmed with programs for controlling the liquid dispensing valve 1, the pump body 2, the first control valve 5, the second control valve 6, the third control valve 7 and the mixing and stirring tank 3. The control program of the PLC controller is an existing technology to achieve the control function of this flow path system. The first control valve 5, the second control valve 6 and the third control valve 7 of this flow path system can perform opening and closing actions after receiving instructions to measure the pH of the acidic pH standard solution, the acidic standard buffer solution and the water sample to be measured in sequence. Before each measurement of the water sample to be measured, the control component always forces an automatic calibration operation using the two standard points of the acidic pH standard solution and the acidic standard buffer solution, ensuring the quality of the measurement data of the water sample to be measured. In the long-term unattended state, it is not necessary for maintenance personnel to go to the site for manual calibration, ensuring the pH of the water sample to be measured and the total alkalinity calculated by pH measured by the on-line analyzer each time.
[0030] Preferably, the liquid dispensing valve 1 is provided with a flow distribution outlet, an air inlet 9, an acidic pH standard solution inlet 10, an acidic standard buffer solution inlet 11 and a water sample to be measured inlet 12.
[0031] Specifically, the liquid dispensing valve 1 is a four-in-one liquid dispensing valve. The acidic pH standard solution inlet 10 is used to introduce an acidic pH standard solution containing a total ion strength adjuster (TISAB, pH 4.00), which is used as one of the standard points in the two-point calibration of the pH electrode; the acidic standard buffer solution inlet 11 is used to introduce an acidic standard buffer solution with a known pH and buffer capacity containing a total ion strength adjuster with the same ionic strength as above, and its pH is denoted as pH 0 , which is used not only as the second standard point in the two-point calibration of the pH electrode, but also as an acidic reagent for mixing and reacting with the water sample of the alkalinity to be measured. The pH after the reaction is denoted as pH 1 ; the air inlet 9 represents an air suction port.
[0032] Preferably, the first control valve is provided with a first inlet and a first outlet 13 and a second outlet 14, and the first outlet 13 is communicated with the mixing and stirring tank 3.
[0033] Preferably, the first control valve 5 is a solenoid valve.
[0034] Specifically, the solenoid valve is a two-position three-way solenoid valve.
[0035] Specifically, the solenoid valve facilitates automatic control.
[0036] Preferably, both the second control valve 6 and the third control valve 7 are pressure tube valves.
[0037] Preferably, the pump body 2 is a peristaltic pump.
[0038] Preferably, the flow path system of the pH and total alkalinity on-line analyzer further includes a filter head, and the filter head is connected to the water sample inlet 12 to be measured.
[0039] Specifically, the water sample to be measured is sucked into the flow path system from the position of the filter head.
[0040] Preferably, the electrode assembly includes a pH potential detection component.
[0041] Specifically, it is used to read the pH of the acidic pH standard solution, acidic standard buffer solution and the water sample to be measured
[0042] Preferably, the flow path system of the pH and total alkalinity on-line analyzer further includes a locator, and the locator is arranged between the second control valve 6 and the electrode assembly 4.
[0043] Specifically, the locator can identify whether it is air or solution in the flow path system to ensure that the pipeline passing through the electrode assembly 4 is filled with the solution to be measured during measurement, and to ensure that the air expels the residue of the previous sample in the flow path system.
[0044] Preferably, both the second outlet 14 and the outlet of the electrode assembly 4 lead to the outside of the system (generally a waste liquid bottle or waste liquid bucket).
[0045] In summary, when the flow path system of the pH and total alkalinity on-line analyzer of the present utility model is implemented, as Figure 1 shown, it specifically includes:
[0046] The calibration steps of the flow path system include:
[0047] The liquid distribution valve 1 is switched to the acidic pH standard solution inlet 10, the second outlet 14 of the first control valve 5 (two-position three-way solenoid valve) is opened and the first outlet 13 is closed, and the acidic pH standard solution is discharged through the liquid distribution valve 1, the pump body 2 and the second outlet 14 of the first control valve 5 for 30 s;
[0048] The third control valve 7 is closed, the second control valve 6 is opened, the second outlet 14 of the first control valve 5 is closed and the first outlet 13 is opened, and the acidic pH standard solution reaches the electrode assembly 4 through the mixing and stirring tank 3 to read the pH corresponding to pH 4.00s And it is forcibly positioned at 4.00, and the acidic pH standard solution is discharged from the outlet of the electrode assembly 4 and lasts for 30 s;
[0049] The liquid distribution valve 1 is switched to the acidic standard buffer solution inlet 11, and the above two steps are repeated, and the pH corresponding to the known pH (pH 0 ) is read and forcibly positioned at pH 0 ;
[0050] The liquid distribution valve 1 is switched to the air inlet 9, the pipeline system is emptied, and it lasts for 30 s.
[0051] The measurement steps of this flow path system include:
[0052] The third control valve 7 is opened, the second control valve 6 is closed, the liquid distribution valve 1 is switched to the water sample to be measured inlet 12, a certain period of time is preset to inhale a quantitative water sample to be measured, the liquid distribution valve 1 is switched to the air inlet 9, and the remaining water sample to be measured in the pipeline before the mixing and stirring tank 3 is pushed into it;
[0053] The liquid distribution valve 1 is switched to the acidic standard buffer solution inlet 11, a certain period of time is preset to inhale an acidic standard buffer solution equal to the water sample to be measured, the liquid distribution valve 1 is switched to the air inlet 9, and the remaining acidic standard buffer solution in the pipeline before the mixing and stirring tank 3 is pushed into it, and the mixing and stirring tank 3 is started for stirring and a certain time delay is set;
[0054] The third control valve 7 is closed, the second control valve 6 is opened, the mixed test solution reaches the electrode assembly 4 and its pH is read, denoted as pH 1 , and the mixed test solution is discharged from the outlet of the electrode assembly 4 and lasts for 30 s;
[0055] Stop the stirring of the mixing and stirring tank 3 and the operation of the pump body 2, open both the second control valve 6 and the third control valve 7, and enter the sleep state to wait for the next wake-up.
[0056] The embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments.
Claims
1. A flow path system of an online analyzer for pH and total alkalinity, characterized in that: The flow system includes: A liquid dispensing valve, a pump body, a mixing and stirring tank and an electrode assembly connected in sequence, wherein the liquid dispensing valve is used to distribute one of air, an acidic pH standard solution containing a total ionic strength regulator, an acidic standard buffer solution containing a total ionic strength regulator and a water sample to be tested into the pump body; a first control valve, a second control valve and a third control valve, wherein the first control valve is arranged between the pump body and the mixing and stirring tank, the first control valve can control the fluid to be discharged from the system or discharged into the mixing and stirring tank, the second control valve is arranged between the mixing and stirring tank and the battery assembly, the mixing and stirring tank is provided with a vent, and the vent is connected to the third control valve; A control component is electrically connected to the liquid dispensing valve, the first control valve, the second control valve, the third control valve and the mixing and stirring tank. The control component can send instructions to the liquid dispensing valve, the first control valve, the second control valve, the third control valve and the mixing and stirring tank to enable the electrode assembly to measure the pH of the acidic pH standard solution, the acidic standard buffer solution and the water sample to be tested in sequence.
2. The flow path system of a pH and total alkalinity online analyzer according to claim 1, characterized in that: The liquid dispensing valve is provided with a dispensing outlet, an air inlet, an acidic pH standard solution inlet, an acidic standard buffer solution inlet and a water sample inlet to be tested.
3. The flow path system of a pH and total alkalinity online analyzer according to claim 1, characterized in that: The first control valve is provided with a first inlet, a first outlet and a second outlet, and the first outlet is communicated with the mixing and stirring tank.
4. The flow path system of a pH and total alkalinity online analyzer according to claim 1, characterized in that: The first control valve is a solenoid valve.
5. The flow path system of a pH and total alkalinity online analyzer according to claim 1, characterized in that: The second control valve and the third control valve are both compression pipe valves.
6. The flow path system of a pH and total alkalinity online analyzer according to claim 1, characterized in that: The pump body is a peristaltic pump.
7. The flow path system of a pH and total alkalinity online analyzer according to claim 2, characterized in that: The flow path system of the pH and total alkalinity online analyzer also includes a filter head, which is connected to the inlet of the water sample to be tested.
8. The flow path system of a pH and total alkalinity online analyzer according to claim 1, characterized in that: The electrode assembly includes a pH potential detection component.
9. The flow path system of a pH and total alkalinity online analyzer according to claim 1, characterized in that: The flow path system of the pH and total alkalinity online analyzer further includes a positioner, which is disposed between the second control valve and the electrode assembly.
10. The flow path system of the online pH and total alkalinity analyzer according to claim 3, characterized in that: The second outlet and the outlet of the electrode assembly both lead to the outside of the system.